only got 6 extensions so far. gonna add more later.
Chromed Bird (Twitter Extension)
Google Docs PDF/Powerpoint Viewer
goo.gl URL shortener
Import to Google Docs
OneNumber (All-in-One Checker for GMail, GVoice, Reader, and GWave)
installing the extensions in Chrome is so quick and painless. no browser restarting and crap like that. click install and it just....works. immediately.